Posted January 1, 200916 yr Recently got in on the Incriminator Black and Blue December sale and purchased a pair of D4 15" LI series subs. These will be going in a 1998 GMC Sierra 4X4 extended cab with 3rd door. Rear seat has been removed so I have the whole back area for subs, amps and batteries. This will be a daily driver with an emphasis on SQ but with the ability to get loud. No competing just enjoyment.What I am wondering is, what would be a good design for the box? Will be going ported tuned to 35Hz. Nick recommended 3-4 cubic feet and I forget how much sq. inch of port but I think 60". Can't get to my yahoo email since Im at work to check.I was thinking woofers front with a rear vented slot port firing into the corners of the back. Looking for some suggestions and advice on what would be good way to fire the woofers. This is a budget build since I have two kids in hockey, a wife and two 200lb dogs to feed.... Thanks in advanceCurtSystem consists of the followingHU: Sony CDX-GT710Front Stage: Oz Audio Matrix Elite 130CS 5.25" in Custom KicksMid Bass: Dragster Audio Art 6.5" in factory doorFront Stage Amp: Sundown SAX100.4DSubwoofers: Pair of Incriminator LI 15 D4Sub Amp: Sundown SAZ1000DAlternator: Factory (Wating to see if upgrade needed)Front battery: InterstateRear battery: Undecided (waiting to see if needed)Wiring: MiscBig 3: Complete with 4 gauge (Upgrade most likely with 0 Gauge)
January 1, 200916 yr I would say 3-4 cubes per 15 also.What most people go by is 12-16 square inches of port per ^ft3 So if your box turns out to be 7 cubes after displacements you should shoot for 84-112 square inches of port.If I was in your situation I would either go sub and port forward or sub and port facing upwards.
January 1, 200916 yr I wouldn't aim the ports into the corners unless you have a decent amount of room between the port opening and the sides of the vehicle. Probably at least 6". It's also generally better to have the subs and port on the same face, or if not no more than 90 degrees away. Most installs I've seen in trucks have both the ports and subs facing up and most of the rest have them both forward.
January 2, 200916 yr Author Thanks for the advice guys. After doing more research and reading. I think I will go subs forward and port forward.
January 2, 200916 yr Author Ok here is what I came up with for a box, external dimensions 52" wide x 22" high x 17" deep with 118" of port tuned to 34Hz. I used a 5.75" wide port.I used the SSA flash box calc to come up with the design. Anybody have any other recommendations?Im open to suggestions, advice or criticism...
January 2, 200916 yr Author I just compared to the RE Box Calculator and came up with the same results.
January 2, 200916 yr Author Isnt the ssa box tool messed up right now?The cut sheet specs are hosed up.
January 3, 200916 yr how accurate is ssa/recalculator vs bassboxpro, because it gives different result with the same designhas anyone compared both ??
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